<p>SALT LAKE CITY — Northrop Grumman has released images of a completed prototype for a new class of autonomous underwater vehicles, as part of the Manta Ray project.
</p><p>A far cry from the powerful solid-state rockets tested in Promontory in Box Elder County, the contract calls for &quot;low-power, high-efficiency undersea propulsion systems,&quot; and low-power&am
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